When you add Curious by Britney Spears, 50ml Eau de Parfum
Item No.: 1238429001
to your basket the CD is added automatically, as a 1p priced item,but the 1p comes of at the checkout,using the free delivery code to get final price.
If you try to use any other discount code it takes away the CD, I think it's because it discounts the 1p as 2 discount codes won't seem to work together,apart from free delivery.
see basket in post 2.
Also go through Quidco too.